Method for installing grating steel frame through traction type arch frame installation trolley

Abstract

The invention relates to tunnel primary support arch frame installation, in particular to a method for installing a grating steel frame through a traction type arch frame installation trolley. Comprising the following steps: (1) optimizing the length and the section number of an arch frame unit; (2) connecting a plurality of single-truss lagging jacks into an integral lagging jack by adopting a positioning tool outside a hole, and transporting the integral lagging jack to a tunnel face by adopting a loading machine to wait for installation; (3) an arch frame mounting trolley is in place, an A unit multi-truss integral arch frame is mounted on a middle arm, and a B unit multi-truss integral arch frame and a C unit multi-truss integral arch frame are mounted on a left arm and a right arm respectively; the initial support arch frame is optimized, so that the installation is more convenient and faster, and the method is more suitable for mechanical construction; an operation area is reasonably planned, personal injury caused by falling rocks and flying rocks is avoided, and the accident rate of group casualties caused by collapse is reduced; the arch frame installation scheme is optimized, the single-process operation time is shortened, and the construction efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the installation of an initial tunnel support arch frame, and in particular to a method for installing a grid steel frame using a traction-type arch frame installation trolley. Background Art

[0002] Traditional arch installation methods often rely on manual operation, which has problems such as high labor intensity, low construction efficiency, and high safety risks. In order to adapt to the development needs of the current era, construction technology also needs to be continuously innovated and keep pace with the times. Therefore, it is urgent to develop a new construction technology to achieve: "efficient, safe, and reliable mechanized construction; scientifically and rationally optimize traditional primary arch frame components, effectively and scientifically design processes; reduce manual labor, reduce construction difficulty, reduce labor intensity, and reduce accident rates." Summary of the invention

[0003] The present invention provides a method for installing a grid steel frame by a traction-type arch frame installation trolley in order to solve the technical problems of high construction difficulty, high strength and low construction efficiency in traditional arch frame installation methods.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for installing a grid steel frame using a traction type arch frame installation trolley, comprising the following steps: (1) Optimize the length and number of arch units. The single arch is optimized into five units, namely one arch crown unit A, two arch waist units B, and two arch foot units C. (2) Multiple arch frame units are connected in parallel by welding with longitudinal connecting ribs, and arch frame spacing positioning tooling and arch frame spacing control tooling are used; they form unit A pre-assembled arch frame, unit B pre-assembled arch frame and unit C pre-assembled arch frame respectively.

[0005] (3) Arch frame installation: transport the pre-assembled arch frame of unit A to the tunnel face and place it perpendicular to the tunnel excavation direction. Place the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C longitudinally along the tunnel excavation direction. Manually connect the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C into a whole. The arch frame installation trolley drives to the tunnel face and is positioned. The pre-assembled arch frame of unit A is grabbed by the middle arm and lifted and installed in place. Then, the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C are pulled by the left and right side arms respectively to connect the arch frames as a whole.

[0006] As a further limitation of the technical solution of the present invention, the arc length of the dome unit A is 1076.5 mm, the arc length of the waist unit B is 748.4 mm, and the length of the foot unit C is 254.6 mm.

[0007] As a further limitation of the technical solution of the present invention, it is characterized in that in step (2), positioning tooling is used outside the hole to connect three single-frame arch frame units in parallel to form an integral arch frame.

[0008] As a further limitation of the technical solution of the present invention, in step (3), the left arm pulls the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C to connect the arch frame as a whole, connect the left arm wire rope to the middle arch frame, gradually raise the left arm, retract the wire rope, pull and push the pre-assembled arch frame into place, and then manually assist in bolting the arch top unit A to the side waist unit B. Similarly, the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C on the right side are installed. After the arch frame is connected and positioned as a whole, manual assistance is performed to weld the steel mesh and system anchor rods at the overlap of the previous cycle.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention takes the construction of high-speed railway double-track tunnels as the background, combines the railway tunnel construction operation standards, similar construction cases, component optimization, and construction process design to discuss, test and summarize, and forms a traction-type arch frame installation trolley to install the grid steel frame construction technology, which solves the problem of manual operation difficulties and reduces the labor intensity of operators; optimizes the initial arch frame to make installation more convenient and more suitable for mechanized construction; reasonably plans the operation area to avoid personal injuries caused by falling rocks and flying rocks, and reduces the group casualty accident rate caused by collapse; optimizes the arch frame installation plan, increases the single process operation time, and effectively improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the arch unit section.

[0011] Figure 2 This is a schematic diagram of the processing of three integral arch frames. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with specific embodiments. Example

[0013] A method for installing a grid steel frame using a traction-type arch frame installation trolley. As a specific and scientific construction method, the present invention comprises the following steps: optimizing the length and number of sections of the arch frame unit, connecting three arch frames outside the tunnel into an integral arch frame, and installing the frame inside the tunnel: (1) optimizing the length and number of sections of the arch frame unit; (2) connecting three single arch frames into an integral arch frame using positioning tooling outside the tunnel, and transporting them to the tunnel face using a loader to wait for installation; (3) putting the arch frame installation trolley in place, installing three integral arch frames of unit A on the middle arm, and installing three integral arch frames of unit B and unit C on the left and right arms, respectively.

[0014] The specific steps include: 1. Arch unit optimization For the installation and construction of the full-section arch frame, the original design of a single arch frame was 7 units, which were optimized to 5 units, including 1 arch crown unit A, 2 arch waist units B and 2 arch foot units C, meeting the on-site installation requirements of the arch frame installation trolley.

[0015] 2. Multiple arch unit connection Multiple arch frame units are connected in parallel by welding with longitudinal connecting ribs, mainly using arch frame spacing positioning tooling and arch frame spacing card controlling tooling.

[0016] First, place the three arch frame vault units A on the positioning tooling to achieve the effect of temporarily fixing multiple arch frames and prevent the arch frames from tipping over during the construction of connecting ribs and meshes. Use the arch frame spacing control tooling to clamp the three arch frame units from the arch part to ensure that the arch frame spacing meets the design requirements.

[0017] 3. Arch installation After the pre-assembled arch frame of unit A is transported to the heading face, it is placed vertically in the direction of tunnel excavation to ensure that the middle arm of the arch frame installation trolley is directly lifted. The pre-assembled arch frames of unit B and unit C are placed longitudinally along the direction of tunnel excavation. In order to facilitate the traction of the side wall of the arch frame installation trolley, the arch waist B unit arch frame and the arch foot C unit arch frame are manually connected into a whole in the tunnel.

[0018] After the arch frame is adjusted into place, the arch frame installation trolley is driven to the face and positioned, and three operators are responsible for remotely controlling the arch frame grabbing arm. First, the pre-assembled arch frame of unit A is grabbed with the middle arm, and the arch frame is lifted and installed into place.

[0019] Then use the left arm to pull the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C to connect the arch frame as a whole, connect the steel wire rope of the left arm to the middle arch frame, gradually raise the left arm, retract the steel wire rope, pull and push the pre-assembled arch frame into place, and then manually assist in connecting the arch frame of unit A and the arch frame of unit B with connecting bolts. Similarly, install the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C on the right side. After the arch frame is connected and positioned as a whole, manual assistance is used to weld the steel mesh and system anchor rods at the overlap of the previous cycle.

[0020] Table 1 Comparative analysis of process time

[0021] It can be seen from Table 1 that the arch frame installation method provided by the present invention improves construction efficiency, saves labor costs, and is safer and more efficient.

Claims

1. A method for installing a grid steel frame using a traction type arch frame installation trolley, characterized in that: The following steps are involved: (1) Optimize the length and number of arch units. The single arch is optimized into five units, namely one arch crown unit A, two arch waist units B, and two arch foot units C. (2) Multiple arch frame units are connected in parallel by welding with longitudinal connecting ribs, and arch frame spacing positioning tooling and arch frame spacing control tooling are used; respectively forming unit A pre-assembled arch frame, unit B pre-assembled arch frame and unit C pre-assembled arch frame; (3) Arch frame installation: transport the pre-assembled arch frame of unit A to the tunnel face and place it perpendicular to the tunnel excavation direction. Place the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C longitudinally along the tunnel excavation direction. Manually connect the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C into a whole. The arch frame installation trolley drives to the tunnel face and is positioned. The pre-assembled arch frame of unit A is grabbed by the middle arm and lifted and installed in place. Then, the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C are pulled by the left and right side arms respectively to connect the arch frames as a whole.

2. The method for installing a grid steel frame using a traction type arch frame installation trolley according to claim 1, characterized in that: The arc length of the dome unit A is 1076.5 mm, the arc length of the waist unit B is 748.4 mm, and the length of the foot unit C is 254.6 mm.

3. The method for installing a grid steel frame using a traction type arch frame installation trolley according to claim 1, characterized in that: In step (2), outside the middle hole, three single-frame arch frame units are connected in parallel to form an integral arch frame using positioning fixtures.

4. The method for installing a grid steel frame using a traction type arch frame installation trolley according to claim 1, characterized in that: In step (3), the left arm pulls the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C to connect the arch frame as a whole, connects the left arm wire rope to the middle arch frame, gradually raises the left arm, retracts the wire rope, pulls and pushes the pre-assembled arch frame into place, and then manually assists in bolting the arch top unit A and the side waist unit B. Similarly, the pre-assembled arch frame of unit B and the pre-assembled arch frame of unit C on the right side are installed. After the arch frame is connected and positioned as a whole, manual assistance is used to weld the steel mesh and system anchor rods at the overlap of the previous cycle.

Images